Neoserica (s. str.) yongkangensis Liu & Ahrens, 2015

Liu, Wan-Gang, Bai, Ming, Yang, Xing-Ke & Ahrens, Dirk, 2015, New species and records of the Neoserica (sensu stricto) group (Coleoptera: Scarabaeidae: Sericini), Journal of Natural History 49 (39), pp. 2379-2395 : 2389-2390

Neoserica (s. str.) yongkangensis Liu & Ahrens , sp. nov.

( Figure 2 E–H )

Type material examined

Holotype ♂ ‘ Yongkang, 29.V.1998, leg. Zhi Junrui’ ( IZAS) . Paratype: 1 ♂ ‘ Yongkang, 29.V.1998, leg. Zhi Junrui’ ( ZFMK) .

Description

Length: 7.3 mm; length of elytra: 5.7 mm; width: 4.3 mm. Body oval, dorsal surface dull and reddish-brown, frons, scutellum and elytral margins slightly darker and with some greenish shine, ventral surface and legs dark brown, antenna yellowish brown, entire body with dense with dense and short, nearly adpressed setae, on dorsal surface with numerous robust and long, dark, erect setae.

Labroclypeus subrectangular, widest at middle, lateral margins straight and subparallel, anterior angles broadly rounded, lateral border and ocular canthus producing a distinct obtuse angle, anterior margin weakly sinuate medially and moderately reflexed, surface moderately convex medially and moderately shiny, coarsely and densely punctate, with numerous long erect setae; frontoclypeal suture weakly incised and moderately angled medially, smooth area anterior to eye about 1.5 times as wide as long; ocular canthus moderately short and robust, finely and sparsely punctate, with three terminal setae. Frons finely and densely punctate, punctures with fine, white, adpressed setae interspersed with moderately dense, large punctures each bearing a robust erect seta. Eyes small, ratio of diameter/interocular width: 0.48. Antenna with 10 antennomeres; club with four antennomeres, as long as remaining antennomeres combined, first joint of club shorter than other three. Mentum elevated and flattened anteriorly.

Pronotum moderately wide, widest at base, lateral margins in basal half nearly straight and subparallel, in anterior half weakly curved and convergent anteriorly, anterior angles not produced and strongly rounded, nearly obsolete, posterior angles obtuse, anterior margin straight, with distinct and fine marginal line, base without marginal line; surface with fine, dense punctures each bearing a fine, white, adpressed seta and interspersed with coarse punctures each bearing a robust, long, erect seta which is slightly directed anteriad; anterior and lateral borders moderately and densely setose; hypomeron carinate, basal margin of hypomeron distinctly produced ventrally. Scutellum subtriangular, apex moderately rounded, with fine and dense punctures and short, adpressed setae, punctures less dense on basal midline.

Elytra oblong, widest at middle, striae moderately impressed, with fine and dense punctures, intervals weakly convex, with fine, dense punctures and fine setae, some spots glabrous and smooth, with only single coarse punctures each bearing a long erect seta (partly abraded in holotype); epipleural edge very fine, ending well before strongly rounded external apical angle of elytra, epipleura densely setose, apical border chitinous, without short microtrichomes.

Ventral surface dull, with large, dense punctures and dense, short adpressed setae, metacoxa with similar punctation and pilosity and with a few robust setae laterally. Abdominal sternites finely and densely punctate, with fine, adpressed setae in punctures, each sternite with transverse row of coarse punctures each bearing a long, robust seta. Mesosternum between mesocoxae as wide as mesofemur, with a few longer setae. Ratio of length of metepisternum/metacoxa: 1/1.55. Pygidium weakly convex, with fine, dense punctures and fine, short and moderately long setae, with a few robust and very long setae beside apical margin, without smooth midline.

Legs moderately slender and shiny, femora with fine and dense punctures, densely setose; anterior edge of metafemur acute and lacking an adjacent serrated line, posterior margin weakly convex, with a few fine setae medially, weakly widened in apical half ventrally but not serrate, serrate dorsally. Metatibia moderately wide, convexly widened at middle, ratio width/length: 1/3.5, dorsally sharply carinate, with two groups of spines, basal group at middle, apical one at three quarters of metatibial length, with a few single spines basally, with a blunt, indistinctly serrate carina from base to middle beside dorsal margin; lateral face longitudinally convex, finely and densely punctate and setose, ventral edge serrate, with three equidistant strong spines; medial face impunctate and smooth, apex sharply truncate interiorly near tarsal articulation. Metatarsomeres glabrous and impunctate dorsally, with sparse, short setae ventrally and strong longitudinal impressions dorsally, with a strongly serrated ridge ventrally and with a distinct longitudinal carina laterally, first metatarsomere almost twice as long as dorsal tibial spur, subsequent metatarsomeres missing in holotype. Protibia short, bidentate.

Aedeagus

Figure 2 E–G .

Diagnosis

The new species differs from all other known Neoserica (s. str.) species in the very long parameres, which equal or exceed the length of the phallobase ( Figure 2E–G ).

Etymology

The new species is named after the type locality, Yongkang ( Figure 3 ).

New records

Figures

Figure 2. (A-D) Neoserica (s. str.) taibaiensis Liu & Ahrens sp. nov. (holotype); (E-H) Neoserica (s. str.) yongkangensis Liu & Ahrens sp. nov. (holotype). (A, E) Aedeagus, left side lateral view; (C, G) aedeagus, right side lateral view; (B, F) parameres, dorsal view; (D, H) habitus. Scale: 0.5 mm.

Figure 3. Distribution of Neoserica (s. str.) fukiensis, N. (s. str.) mengsongensis, N. (s. str.) pseudosangangana, N. (s. str.) sangangana, N. (s. str.) taibaiensis and N. (s. str.) yongkangensis.